Process of producing an electrically insulative film

Details Process of producing an electrically insulative film Process of producing an electrically insulative film

1978-07-17

1979-09-18

Rutledge, L. Dewayne

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148 315, 148122, H01F 104

Patent

active

041681894

ABSTRACT:
A process of producing an electrically insulative glass film on cold reduced silicon steel strip or sheet stock which will have a magnetic permeability greater than 1850 at 796 A/m after a final high temperature anneal which develops cube-on-edge orientation, which comprises applying an aqueous slurry containing magnesia, at least one boron compound, and up to 20% titanium dioxide, based on the weight of magnesia, drying the coating, and subjecting the coated stock to said final anneal, the total boron content being proportioned within the range of about 0.07% to about 0.30%, based on the weight of magnesia, in accordance with any two of the three parameters: particle size distribution, citric acid activity, and surface area, i.e., inversely to the bulk density of the dried coating. Improved core loss characteristics are obtained without sacrifice of permeability values.

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